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Lag :: Lag (n.) The amount of retardation of anything, as of a valve in a steam engine, in opening or closing..

Piston :: Piston (n.) A sliding piece which either is moved by, or moves against, fluid pressure. It usually consists of a short cylinder fitting within a cylindrical vessel along which it moves, back and forth. It is used in steam engines to receive motion from the steam, and in pumps to transmit motion to a fluid; also for other purposes..

Supervise :: Supervise (v. t.) To oversee for direction; to superintend; to inspect with authority; as, to supervise the construction of a steam engine, or the printing of a book..

Abutment :: Abutment (n.) A fixed point or surface from which resistance or reaction is obtained, as the cylinder head of a steam engine, the fulcrum of a lever, etc..

Pack :: Pack (n.) To render impervious, as by filling or surrounding with suitable material, or to fit or adjust so as to move without giving passage to air, water, or steam; as, to pack a joint; to pack the piston of a steam engine..

Governor :: Governor (n.) A contrivance applied to steam engines, water wheels, and other machinery, to maintain nearly uniform speed when the resistances and motive force are variable..

Collapse :: Collapse (v. i.) To fall together suddenly, as the sides of a hollow vessel; to close by falling or shrinking together; to have the sides or parts of (a thing) fall in together, or be crushed in together; as, a flue in the boiler of a steam engine sometimes collapses..

Stroke :: Stroke (v. t.) The movement, in either direction, of the piston plunger, piston rod, crosshead, etc., as of a steam engine or a pump, in which these parts have a reciprocating motion; as, the forward stroke of a piston; also, the entire distance passed through, as by a piston, in such a movement; as, the piston is at half stroke..

Regulator :: Regulator (n.) A contrivance for regulating and controlling motion, as: (a) The lever or index in a watch, which controls the effective length of the hairspring, and thus regulates the vibrations of the balance. (b) The governor of a steam engine. (c) A valve for controlling the admission of steam to the steam chest, in a locomotive..

Rock Shaft :: Rock shaft () A shaft that oscillates on its journals, instead of revolving, -- usually carrying levers by means of which it receives and communicates reciprocating motion, as in the valve gear of some steam engines; -- called also rocker, rocking shaft, and way shaft..

Organ :: Organ (n.) A component part performing an essential office in the working of any complex machine; as, the cylinder, valves, crank, etc., are organs of the steam engine..

Lag :: Lag (n.) A stave of a cask, drum, etc.; especially (Mach.), one of the narrow boards or staves forming the covering of a cylindrical object, as a boiler, or the cylinder of a carding machine or a steam engine..

Spanner :: Spanner (n.) A contrivance in some of the ealier steam engines for moving the valves for the alternate admission and shutting off of the steam.

Vacuum :: Vacuum (n.) The condition of rarefaction, or reduction of pressure below that of the atmosphere, in a vessel, as the condenser of a steam engine, which is nearly exhausted of air or steam, etc.; as, a vacuum of 26 inches of mercury, or 13 pounds per square inch..

Fly :: Fly (v. i.) A heavy wheel, or cross arms with weights at the ends on a revolving axis, to regulate or equalize the motion of machinery by means of its inertia, where the power communicated, or the resistance to be overcome, is variable, as in the steam engine or the coining press. See Fly wheel (below)..

Horse Power :: Horse power () A unit of power, used in stating the power required to drive machinery, and in estimating the capabilities of animals or steam engines and other prime movers for doing work. It is the power required for the performance of work at the rate of 33,000 English units of work per minute; hence, it is the power that must be exerted in lifting 33,000 pounds at the rate of one foot per minute, or 550 pounds at the rate of one foot per second, or 55 pounds at the rate of ten feet per second

Dashpot :: Dashpot (n.) A pneumatic or hydraulic cushion for a falling weight, as in the valve gear of a steam engine, to prevent shock..

Load :: Load (v.) The work done by a steam engine or other prime mover when working.

Shaft :: Shaft (n.) A solid or hollow cylinder or bar, having one or more journals on which it rests and revolves, and intended to carry one or more wheels or other revolving parts and to transmit power or motion; as, the shaft of a steam engine..

Trunnioned :: Trunnioned (a.) Provided with trunnions; as, the trunnioned cylinder of an oscillating steam engine..

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